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tectivirus
''Tectivirus'' is a genus of viruses, and is currently the only genus in the family ''Tectiviridae''. Gram-negative bacteria serve as natural hosts. There are currently four species in this genus including the type species Enterobacteria phage PRD1.〔(【引用サイトリンク】url=http://viralzone.expasy.org/all_by_species/579.html )〕〔(【引用サイトリンク】title=Virus Taxonomy: 2014 Release )〕 Tectiviruses have no head-tail structure, but are capable of producing tail-like tubes of ~ 60×10 nm upon adsorption or after chloroform treatment. The name is derived from Latin ''tectus'' (meaning 'covered').
==Virology==
The virions of Tectiviridae species are non-enveloped, icosahedral and display a pseudo T=25 symmetry.〔 The capsid has two layers. The outer layer is a protein structure of 240 capsid proteins trimers, and the inner one is a proteinaceous lipid membrane which envelopes the virus genome. Apical spikes extending about 20 nanometers (nm) protrude from the icosahedrons vertices.
The genome is a single molecule of linear double-stranded DNA of 15 kilobases in length, and has 30 open reading frames.〔 It forms a tightly packed coil and encodes several structural proteins. It encodes about 30 proteins that are transcribed in operons. At least 9 structural proteins are present in the viron. The genome is about 66 megaDaltons in weight and constitutes 14–15% of the virion by weight. Lipids constitute a further 15% by weight. Carbohydrates are not present.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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